Tool joint



Nov. 20, 11923. 19474,@@5

A. s. KESZTHELYI TOOL JOINT Filed Jan, l2, 1923 Fetented Nov. E, 123.

nain rar l S. KESZTHELYI, OF LOS ANGELES, CFRNEA.

TGOL JTONT.

Application tiled January 12, 1928. Serial No. 612,285.

To all whom it may concern:

Be it known that I, ALEXANDER S. Kesz- THELYT, a citizen of the United States, residing at Los Angeles, in the county of Los Angeles and State of California, have invented a new and usefulv improvement in Tool Joints, of which the following is a specification.

My invention relates to tool joints such as are used in rotary drilling of oil wells. In the drilling of oil wells by the so called rotary system, it is common practiceto rotate a string of drill pipe by suitable mechanism, this pipe'carrying at its lower end the 'bit which by its action on the various formations encountered produces the hole. Whenever the bit has to be sharpened it is necessary to pull the drill pipe, uncoupling it at intervals. lt is now common practice to build the derrick suiiciently high to take three or four lengths of drillpipe 'to a stand so that the pipe is unjointed only at every fourth joint as it is pulled from the wells, these stands being then stood on the floor of and inside the derrick as they are withdrawn and unjointed. Since the bit is necessarily often withdrawn, it is necessary to provide tool joints at every fourth joint to prevent the threads on the pipe from being injured by this frequent coupling and uncoupling.

Tool joints as commonly constructed and used consist of a pair of steel collars, each of which is adapted to bescrewed on the endv of an ordinary joint of pipe using the threads with which such pipe is ordinarily provided, one of these collars having a pipe with a steep taper and coarse threads and the other collar havin a box into which this pin is threaded. 'I-lese tool joints are used at each end of each stand of pipe, each stand usually consisting of four joints of pipe, the collar having the pipe being secured on one end and the collar with the box being secured on the other.

Since it is often disastrous to have a string of drill pipe part especially when being inserted or Withdrawn, it is the common practice to setup these tool joints by the use of the power driven rotary table so that the friction on the' threads between the box and the pin is very great and even when so set up 1t is not uncommon for the joints to become loose or even to become unscrewed.

It is an object of my invention to rovide a novel form of tool jointin which t e friction on' the threads is not entirely depended upon to hold the joint together but supplemental frictional means are provided for this purpose.

In rotary drilling a stream of mud laden fluid, usually heavy clay in suspension in water, is used, the fluid being forced by heavy mud pumps down through the string of drill pipe and through the bit into the bottom of the hole flowing upwardly outside the pipe and serving to lubricate the hole and mud up the formations and support the walls. To make this system of mud circulation e'ective it is often necessary to apply considerable pressure to the upper end of the drill pipe and it is often a difficult matter using the present type of tool joint to insure tight joints at the ends of the-stands at thetool joint pins. lt is a further object of my invention to provide auxiliary means insuring a tight joint at all times.

Further objects and advantages will be made evident hereinafter.

Referring to the drawing which is for illustrative purposes only,

Fig. 1 is a cross section of the adjacent ends of two stands of pipe equipped with my invention. v

Fig. 2 is a section on a plane indicated by the line 2-2 of Fig. 1.

Fig. 3 is a section through one alternate fonm of my invention and,

Fig. 4r is a similar section through another alternate form.

In the form shown in Fig. 1, 11 and 12 are the adjacent ends of two strings of drill pipe, the pipe 11 having a collar 13 and the ipe 12 having a collar 14 lscrewed thereon. ormed on the collar 13 is a projection 15 which is externally threaded with a coarse tapered thread as shown. Surrounding the projection 15 is a groove 16 and outside the groove is a shoulder or lip 17 which is provided With a conical openln The collar 14 has an external conical surface 18 which is of proper taper and size to t into the 'groove 16 insidev the lip 17 as the joint is V.vided with an internal threaded recess 19 into which the projection 15 :may he threaded. Formed. in the. collar 13 surrounding a central opening 20 which extends therethrough there may be provided an enlarged opening 21 which is of proper size to receive a projection 22 extendin upwardly, as shown, Jlirtnnn the collar 14. The parts are so lll) . pipe and having proportionedv that whenv the collars are screwed home, there is still a little space therebetween fon all surfaces which are at r'i ht angles tothe axis of the pipe. f

h this referred form of my invention, it is possible.l to obtain a very tight joint between the collars 13 and 14 due to the tapered lip 17 which cooperates with its .complementary part on thecollar 14. This Vtapered surface not only acts to produce a 31- and 32 which are threaded at 33 to receive the drill pipe, the collar 32 having an outer lip 34 which is internally threaded .and an inner pin 35 which is externally threaded. These arts fit into com lementary portions ofp the tool joint 31. he 'threads onv the outer' lip 34 and the inner pin 35 are simultaneously threaded by a combination special tool.

In the form of my `invention shown in Fig. 4 I provide two collars 41 and 42 which are threaded at 44 to' receive'the drill pipe. The collar 41 has an external lip 46 and an internal pin 47. A connecting member. 45

is threaded on both the lip and the pin and is in turn provided with an internal conical o ening internally threaded to receive a t readed projection on the collar 42. This form is a variation of the other forms shown, which was ado ted b me for manu'- facturing reasons an whic may be used to insure a very ti ht joint by making the threads on the colar 41 and its attendant portion of the member 48 of a slightly different pitch than the threads between the member 48 and the collar 42.

It' is obvious that other forms might be devised that would embody my invention which I desire shall be definedv solely by the annexed claims.

I claim as my invention: l

1. A tool joint comprising: aprimary collar adapted to be secured to a jointof an. opening therethrough2 said openm being in open communlcation with' t e interior of .said

pipe; a secondary collar adapted to be secured to a joint of pipe and Ahaving an 0 opening therethrough, said opening being in open communication with the.. interior of said pipe; a lip formed on the outer edge of said primary collar and enclosing agroove a proect'ing portion of said secondarycollar fitting inside said groove 'and 1inside said lip; and vthreaded means .for

.forcing said collar'to'wards each otherA in an axial direction.

2. A tool jointes in claim 1 in which the interior surface'ofsa'idli is conical and the projecting portion of said secondary collar litting inside said conical `surface is also coiled to fit in fluid tight relationship therein...

3. A tool jointl as -in'claim 1 in which the means for lforcing said collars together'comprises: laconical projection having an external thread and formed :onone of said collars; and an internally threaded portion on the other collar into which said projection fits and is threaded.

4.` A tool joint comprising: a primary collar adapted to be secured to a joint of pipe; a secondar collar ada ted to be se'- cured toajointo pipe; a lip ormed onthe outer edge of said primarycollar and enclosing a groove; a projecting portion of said secondary collar fitting inside said groove.

and inside said lip;aconi'cal projection having an external thread and formed centrally on said primarycollar; and an internally threaded ortion on said secondary collar into whic said projection tits and is threaded.

5. A tool joint :comprising: a rimary collar adapted lto be secured toa joint of pipe and aving an opening ,thereth rough in open communlcation with the interior. of said pipe; a seconda?7 collar ada ted to be secured4 to ,a joint o pipe andl aving an opening therethrough 1n open communica'- `t1on with-the interior of said `,pipe and with the -opening in said primary. collar; a lip formed on the outer edge of said primary collar and enclosing a groove; a projecting portion of said secondary collar fitting inside said groove and inside-said lip; Va conical rejection having a'n`external v thread 'and 

